Title:
RACK AND PINION TYPE STEERING DEVICE AND METHOD OF MANUFACTURING THE SAME
Document Type and Number:
WIPO Patent Application WO/2007/052829
Kind Code:
A1
Abstract:
Disclosed are a rack and pinion type steering device capable of reducing contact
surface pressures, suppressing the wear of contact surfaces, and preventing
a rack guide movable amount from being excessively increased by increasing the
contact area of the outer peripheral surface of a roller on the outer peripheral
surface of a rack shaft in a rack guide; and a method of manufacturing the steering
gear. The cross sectional shape of the outer peripheral surface of the roller
(24) is formed in an outer peripheral surface having a cross sectional shape formed
of two circular arcs and the outer peripheral surface is surface hardened. A pinion
shaft, the rack shaft, and a rack guide holder are assembled in a housing, and an
adjust screw is strongly tightened to press the rack guide holder toward the rack
shaft under an overload. In this pressed state, a torque is applied to the pinion
shaft to reciprocate the rack shaft (15) in the axial direction to plastically
deform the outer peripheral surface of the roller (24) in the shape of the outer
peripheral surface of the rack shaft. The outer peripheral surface of the roller
(24) is brought into line contact with the outer peripheral surface of the rack
shaft (15) at portions (C) and (D) to increase the contact area.
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Inventors:
NISHIKUBO HIROKI (JP)
Application Number:
PCT/JP2006/322321
Publication Date:
May 10, 2007
Filing Date:
November 01, 2006
Export Citation:
Assignee:
NSK LTD (JP)
NISHIKUBO HIROKI (JP)
NISHIKUBO HIROKI (JP)
International Classes:
B62D3/12; F16H19/04
Foreign References:
| JPH0580957U | 1993-11-02 | |||
| JPH1191591A | 1999-04-06 |
Attorney, Agent or Firm:
SADASHIGE, Kazuo (6-7 Akasaka 1-Chome, Minato-K, Tokyo 52, JP)
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